Cook's Illustrated is an American cooking magazine published every two months by America's Test Kitchen Limited Partnership (ATK) in Brookline, Massachusetts. It accepts no advertising and is characterized by extensive recipe testing and detailed instructions. The magazine also conducts thorough evaluations of kitchen equipment and branded foods and ingredients.

On February 2, 2023, Cook's Illustrated was one of ATK's brands included in the sale of its controlling interest to Marquee Brands.